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    "##### what is linear models"
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    "The following are a set of methods intended for regression in which the target value is expected to be a linear combination of the features.\n",
    "In mathematical notation, if is the predicted value.\n",
    "![linear_combination_formula](./pics/linear_combination_formula.png)\n",
    "Across the module, we designate the vector ![linear_combination_coef](./pics/linear_combination_coef.png) as coef_ and ![linear_combination_intercept](./pics/linear_combination_intercept.png) as intercept_.\n"
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